Carvalho struck in injury-time for the draw.
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Afterwards, he said: "I knew that I wasn't going to win the first header but I thought that, if I snuck around, I might get my chance - and I did!
"We've been working on it on the training pitch and it paid off today."
He added: "You've got to smell where the ball's going to land. It was similar to the Bournemouth one, where Kris Ajer knocked it down; I know there's a high chance that, if he goes up, he'll win the header.
"I didn't get a chance to celebrate because Sepp (van den Berg) jumped on me! But that's what football is about and we more than deserved it."